4009478
Thermostat
Cummins®

Introduction

The Cummins 4009478 Thermostat is a component designed for use in commercial trucks, specifically within the engine cooling system. Its primary function is to regulate the engine’s operating temperature, ensuring it remains within an optimal range for efficient performance and longevity.

Basic Concepts of a Thermostat

A thermostat is a device that senses the temperature of a system and performs actions to maintain that temperature within a desired range. In the context of an engine cooling system, the thermostat controls the flow of coolant between the engine and the radiator. When the engine is cold, the thermostat remains closed, preventing coolant flow to the radiator and allowing the engine to warm up quickly. As the engine temperature rises, the thermostat opens, allowing coolant to circulate through the radiator where it is cooled before returning to the engine ¹.

Purpose of the Cummins 4009478 Thermostat

The Cummins 4009478 Thermostat plays a role in maintaining optimal engine temperature by regulating the flow of coolant. This regulation ensures the engine operates efficiently and protects it from damage due to overheating or underheating. By maintaining the correct temperature, the thermostat contributes to fuel efficiency, reduces emissions, and extends the engine’s lifespan ².

Key Features

The Cummins 4009478 Thermostat is engineered with specific design and construction features to enhance its performance and reliability. These features include the use of durable materials that can withstand high temperatures and pressures, precise sealing mechanisms to prevent coolant leaks, and a temperature range that is tailored to the specific requirements of Cummins engines. These attributes ensure the thermostat can operate effectively under a wide range of conditions ³.

Benefits

The advantages provided by the Cummins 4009478 Thermostat include improved engine efficiency, extended engine life, and consistent performance under varying operating conditions. By maintaining optimal engine temperature, the thermostat helps to ensure that the engine operates within its designed parameters, leading to better fuel economy and reduced wear on engine components. Additionally, the consistent performance of the thermostat under different conditions contributes to the overall reliability of the engine ⁴.

Installation and Compatibility

Proper installation of the Cummins 4009478 Thermostat is crucial for ensuring it functions correctly within the engine cooling system. Installation guidelines should be followed to ensure the thermostat is correctly fitted, with attention paid to the orientation and sealing to prevent leaks. The thermostat is compatible with various Cummins engines, and it is important to verify compatibility with the specific engine model to ensure optimal performance.

Troubleshooting and Maintenance

Common issues that may arise with thermostats include failure to open or close properly, leading to overheating or underheating of the engine. Diagnostic procedures for identifying problems with the thermostat may include checking for proper operation within the specified temperature range and inspecting for signs of wear or damage. Maintenance tips to ensure the longevity and effectiveness of the Cummins 4009478 Thermostat include regular inspection for signs of wear, ensuring proper installation, and replacing the thermostat according to the manufacturer’s recommendations or if signs of failure are detected.

Performance in Various Conditions

The Cummins 4009478 Thermostat is designed to perform effectively under different operating conditions, such as extreme temperatures, heavy loads, and varying speeds. Its ability to maintain optimal engine temperature under these conditions contributes to consistent engine performance, fuel efficiency, and longevity. The thermostat’s design and construction features ensure it can withstand the demands of commercial truck operation, providing reliable temperature regulation regardless of the conditions.

Cummins Overview

Cummins Inc. is a global power leader that designs, manufactures, and distributes a wide range of power solutions, including engines, filtration, and emissions solutions. With a history of innovation and commitment to quality, Cummins has established a strong reputation in the commercial truck industry. The company’s product range includes engines and components designed to meet the demanding requirements of commercial applications, demonstrating Cummins’ dedication to providing reliable and efficient power solutions.

Thermostat 4009478 Compatibility with Cummins Engines

The thermostat part number 4009478, manufactured by Cummins, is designed to be compatible with several of their engine models. This part is essential for maintaining optimal engine temperature, ensuring efficient operation and longevity of the engine.

QSK19 Engines

For the QSK19 engines, the thermostat 4009478 is specifically engineered to fit both the QSK19 CM2350 and QSK19 CM850 models. These engines are known for their robust performance and reliability, often used in heavy-duty applications. The thermostat ensures that the engine operates within the ideal temperature range, preventing overheating and ensuring efficient fuel consumption.

K105 Engine

The K105 engine also benefits from the use of the thermostat 4009478. This engine, like the QSK19 series, is designed for demanding applications, and the thermostat plays a crucial role in maintaining its performance. By regulating the engine’s temperature, it helps in reducing wear and tear, thereby extending the engine’s lifespan.

MCRS Engine

Lastly, the thermostat 4009478 is compatible with the MCRS engine. This engine is part of the Cummins lineup that is engineered for specific industrial applications. The thermostat ensures that the engine maintains the necessary temperature for peak performance, which is critical for the efficiency and reliability of the engine in its intended use.

Role of Part 4009478 Thermostat in Engine Systems

The part 4009478 thermostat is an integral component within the engine’s cooling system, ensuring optimal operating temperatures are maintained. It works in conjunction with several other components to regulate the flow of coolant through the engine.

Interaction with the Thermostat Housing

The thermostat is housed within the thermostat housing, a component designed to contain and protect the thermostat. The housing is typically made from durable materials such as aluminum or plastic to withstand the pressures and temperatures of the cooling system. The thermostat fits snugly into the housing, creating a seal that prevents coolant leakage.

Integration with the Thermostat Top-Level Assembly Housing

In more complex engine systems, the thermostat may be part of a top-level assembly housing. This assembly often includes additional components such as sensors and gaskets, which work together to monitor and control the engine’s temperature more precisely. The thermostat within this assembly plays a key role in opening and closing at specific temperatures to allow coolant to flow through the engine.

Function within the Overall Arrangement

In the overall arrangement of the engine’s cooling system, the thermostat is positioned between the engine block and the radiator. When the engine is cold, the thermostat remains closed, preventing coolant from flowing to the radiator. As the engine warms up, the thermostat gradually opens, allowing coolant to circulate through the engine and radiator, dissipating heat and maintaining a stable operating temperature.

This systematic interaction ensures that the engine neither overheats nor remains too cold, optimizing performance and efficiency. The precise fit and function of the part 4009478 thermostat within these components are essential for the reliable operation of the engine’s cooling system.

Conclusion

The Cummins 4009478 Thermostat is a critical component in the engine cooling system of commercial trucks, designed to maintain optimal engine temperature for efficient performance and longevity. Its key features, benefits, and compatibility with various Cummins engines highlight its importance in ensuring reliable and efficient engine operation. Proper installation, maintenance, and understanding of its role within the engine system are essential for maximizing the performance and lifespan of the engine.